:bug: Split the reports landscape unknown/unassessed chart

[sjd78]

Resolves: https://issues.redhat.com/browse/MTA-2678

On the reports page, split the combine Unknown / Unassessed landscape chart into separate charts.

Unknown and unassessed are two different risk states.

[sjd78]

Screenshot:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 42.37%. Comparing base (b654645) to head (725d650). Report is 211 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2052 +/- ## ========================================== + Coverage 39.20% 42.37% +3.17% ========================================== Files 146 172 +26 Lines 4857 5520 +663 Branches 1164 1381 +217 ========================================== + Hits 1904 2339 +435 - Misses 2939 3065 +126 - Partials 14 116 +102 ``` | [Flag](https://app.codecov.io/gh/konveyor/tackle2-ui/pull/2052/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=konveyor) | Coverage Δ | | |---|---|---| | [client](https://app.codecov.io/gh/konveyor/tackle2-ui/pull/2052/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=konveyor) | `42.37% <ø> (+3.17%)` | :arrow_up: | | [server](https://app.codecov.io/gh/konveyor/tackle2-ui/pull/2052/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=konveyor) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=konveyor#carryforward-flags-in-the-pull-request-comment) to find out more.

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